300-440 Question 61
Single answerA network engineer is troubleshooting an EIGRP network. A route to the 192.168.10.0/24 network is not being installed in the routing table. Upon analyzing the EIGRP topology table, the route has a Feasible Distance (FD) of 25,000 and a Reported Distance (RD) of 20,000. No feasible successor is available, and the route status is marked as 'stuck in active (SIA)'. What is the likely cause of this issue?
- A
The route's Feasible Distance (FD) is higher than the Reported Distance (RD).
- B
The EIGRP query process did not receive a reply within the Active timer limit.
- C
The route does not meet the feasibility condition (RD < FD).
- D
There is no successor route available for the 192.168.10.0/24 network.
Show answer and explanation
Correct answer: B
Explanation
When a route is marked as 'stuck in active (SIA)' in EIGRP, it indicates that EIGRP sent queries to its neighbors regarding the route but did not receive a reply within the Active timer limit. This is often caused by network issues such as high congestion, misconfiguration, or unresponsive neighbors. In this scenario, the route has no feasible successor, and the SIA status results from the query process timing out.
- A. Incorrect.
Incorrect: The feasibility condition is not determined by comparing FD to RD in this manner. The feasibility condition requires that RD < FD for a route to become a feasible successor.
- B. Correct.
Correct: When a route is 'stuck in active (SIA)', it means the EIGRP query process did not receive a reply from one or more neighbors before the Active timer expired. This could happen due to network issues or misconfigured neighbors.
- C. Incorrect.
Incorrect: The feasibility condition (RD < FD) applies to feasible successors. However, this does not directly explain why the route is SIA.
- D. Incorrect.
Incorrect: While it is true that no successor route is available, this alone does not explain why the route is stuck in active. The SIA state is specifically related to unacknowledged queries.